Fluid handling – Self-proportioning or correlating systems – Self-controlled branched flow systems
Patent
1998-09-04
2000-02-01
Recla, Henry J.
Fluid handling
Self-proportioning or correlating systems
Self-controlled branched flow systems
13750515, 137489, 137492, 137906, G05D 1100, F16K 3112, E03B 2509
Patent
active
06019121&
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a pressure reducing valve for reducing the pressure of a pressurized fluid supplied from the primary side to a desired pressure and discharging the fluid to the secondary side.
BACKGROUND ART
In general, when a pressurized fluid is supplied at a desired preset pressure from a pressurized fluid supply source to a pressurized fluid-driven apparatus, a pressure reducing valve is installed between the pressurized fluid supply source and the pressurized fluid-driven apparatus. The pressure reducing valve is operated such that the pressurized fluid on the primary side, which is supplied from the pressurized fluid supply source, is subjected to pressure reduction to a predetermined pressure suitable for the pressurized fluid-driven apparatus connected to the secondary side, and the fluid is supplied to the secondary side.
A pressure reducing valve, which has been suggested by the present applicant, is shown in FIG. 13.
The pressure reducing valve 1 comprises a main body unit 4 formed with a primary port 2 used to make connection on the side of a pressurized fluid supply source and a secondary port 3 used to make connection on the side of a pressurized fluid-driven apparatus, a bonnet 6 integrally coupled to the main body unit 4 and including a spring member 5 formed therein, and a handle 7 provided rotatably on an upper portion of the bonnet 6.
A central exhaust port 8 is formed at one side surface of the main body unit 4. The central exhaust port 8 functions as a bleed port for discharging an excessive amount of the pressurized fluid supplied from the primary port 2 to the atmospheric air, and it is also used as an exhaust port for discharging the pressurized fluid on the secondary side at a pressure higher than a preset pressure to the atmospheric air.
A first diaphragm 9, a second diaphragm 10, and a third diaphragm 11 are provided to extend at the inside of the main body unit 4. Those provided between the first diaphragm 9 and the second diaphragm 10 include a first diaphragm chamber 12 which communicates with the secondary port 3 via a first passage 12a, a nozzle back pressure chamber 13 which is formed separately from the first diaphragm chamber 12, and a flapper 14 and a nozzle 15 which perform seating operation or make separation from each other in accordance with an action of the pressurized fluid introduced into the nozzle back pressure chamber 13.
A second diaphragm chamber 16, which communicates with the central exhaust port 8, is provided between the second diaphragm 10 and the third diaphragm 11. On the other hand, a third diaphragm chamber 17 is provided under the third diaphragm 11. A communicating hole 18 for communicating the second diaphragm chamber 16 with the third diaphragm chamber 17 is formed through the third diaphragm 11. A valve plug 19 is provided so that its one end engages with the communicating hole 18. The valve plug 19 is in a state of being urged upwardly by the aid of the resilient force of a spring member 20. A communicating passage 21 between the primary port 2 and the secondary port 3 is opened or closed when the valve plug 19 makes separation or seating with respect to a seat section. A second passage 22 for communicating the primary port 2 with the nozzle back pressure chamber 13 is formed in the main body unit 4.
The operation of the pressure reducing valve 1 will be schematically explained below.
The pressurized fluid is supplied from the primary port 2 in a state in which the nozzle 15 and the flapper 14 are separated from each other by a predetermined spacing distance without exerting the resilient force of the spring member 5. The pressurized fluid passes through the second passage 22, and it is introduced into the nozzle back pressure chamber 13. The pressurized fluid passes through the gap between the nozzle 15 and the flapper 14, and it is introduced into the first diaphragm chamber 12. The pressurized fluid, which has been introduced into the first diaphragm chamber 12, passes through the first passage 12a, the t
REFERENCES:
patent: 2747599 (1956-05-01), Watson
patent: 2806481 (1957-09-01), Faust
patent: 2977966 (1961-04-01), Matthews
patent: 3001535 (1961-09-01), Mueller
patent: 3102549 (1963-09-01), Worden et al.
patent: 3115147 (1963-12-01), Mueller
patent: 3926204 (1975-12-01), Earl
deVore Peter
Recla Henry J.
SMC Kabushiki Kaisha
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